Difference Between \n, \r, and Environment.NewLine

\n 

• CR (Carriage Return)
• Same as (char)13
• Used as a new line character in Unix

\r

• LF (Line Feed)
• Used as a new line character in Mac OS

\n\r

• CR + LF (Carriage Return + Line Feed)
• Used as a new line character in Windows

Environment.NewLine

• Any of the above codes, based on the Operating System
• This is the preferred method

Source: http://social.msdn.microsoft.com/forums/en-US/csharplanguage/thread/47af2197-26b4-4b9e-90e8-bfa9d5cd05b4